单项选择题

A．People will become seriously ill.
B．People will become dependent on them.
C．They will make people feel tired.
D．They will give people headaches.
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单项选择题
A．She has bought a new one.B．She has none at present.C．She only has an old one.D．Her sister has given her one.
A．She has bought a new one.
B．She has none at present.
C．She only has an old one.
D．Her sister has given her one.
填空题
teenagers
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